求助大佬，用java中for循环怎么写这个

Posted 2023-03-20

参考技术A

写的不够严谨，我也是初学没多久。咳咳

参考技术B

这样也可以

参考技术C public class StarTest
static int n = 9;
static String[][]arr1 = new String[3*n-1][3*n];
static String[][]arr2 = new String[3*n][3*n];
public static void main(String[] args)

for (int i = 0; i < 3*n-1; i++) //先将其全部赋值为空
for (int j = 0; j < 3*n; j++)
arr1[i][j] = " ";



for (int i = 0; i < n; i++)
for (int j = 0; j < 3*n-(i+1)*2; j++)//先将其全部赋值为"*"
arr1[i][j] = "*";

for (int j = 0; j < 3*(n-i-1); j++)
arr1[i][j] = " ";



//////////////////下半部分/////////////////////////////////////
for (int i = 0; i < 3*n; i++) //先将其全部赋值为空
for (int j = 0; j < 3*n; j++)
arr2[i][j] = " ";



for (int i = n; i >=0; i--)
for (int j = 0; j < n+2*(i); j++)
arr2[i][j] = "*";

for (int j = 0; j <= 3*i-1; j++)
arr2[i][j] = " ";



showStar();


private static void showStar()
///////显示上半部分/////////////
for (int i = 0; i < n-1; i++)
for (int j = 0; j < arr1[i].length; j++)
System.out.print(arr1[i][j]);

System.out.println();

///////显示下半部分/////////////
for (int i = 0; i < n; i++)
for (int j = 0; j < arr2[i].length; j++)
System.out.print(arr2[i][j]);

System.out.println();



参考技术D 求助大佬，